In our work, we exploit Xue et al.'s method [1]} for feature extraction. Xue et al. utilize gradient magnitude (GM) and Laplacian of Gaussian (LoG) maps to describe the structural information for image perceptual quality assessment. Their method is driven by the image statistics, and exploits the histogram information, which is perfect for low-level vision tasks, such as ours. Motivated by this observation, we employ GM and LoG features to represent the local spatial contrast information in images.
